I don't know if you remember that in July 17, 1996 a plane that was directed to Paris was shot by a missile near New York, over the ocean. The fact was fastly hidden by the governement of the U.S. and other causes were accorded to that accident, like a bomb on board or a simple explosion of the fuel tank. There were many witnesses that saw something like a missile going to that plane before it exploded. If you want more information go to the sites below:http://en.wikipedia.org/wiki/TWA_Flight_800http://www.whatreallyhappened.com/RANCHO/CRASH/TWA/twa.html
I think that this could be related to what happened on 9/11, and could be a preparation for what happened to the planes that were supposed to have hit the world trade center. If the government could kill almost 3000 americans on that day, then they should have killed the persons on those planes. Otherwise why would they have shot down that airplane and never give a concrete answer of what happened that day and keep it in mistery? The 9/11 attacks were being prepared sice a long time ago, and remember that in 1997 the wtc appeared in crosshairs on the cover of FEMA's magazine.